private func loadArticles() {

        // this url should be part of the URL builder scheme and not right inside the
        // view controller but right now we are focused on MVVM
        let url = URL(string: "https://newsapi.org/v1/articles?source=the-next-web&sortBy=latest&apiKey=0cf790498275413a9247f8b94b3843fd")!

        // this web service should use generic types. Again this is not part of the implementation
        // as we are focusing on MVVM model
        Webservice().getArticles(url: url) { articles in
            print(articles)

            let articles = articles.map { article in
                return ArticleViewModel(article :article)
            }

            self.viewModel = ArticleListViewModel(articles :articles)

        }
    }